The Influence of Fracturing Fluid Volume on the Productivity of Coalbed Methane Wells in the Southern Qinshui Basin

Wenwen Chen, Xiaoming Wang (), Mingkai Tu, Fengjiao Qu, Weiwei Chao, Wei Chen and Shihui Hou
Additional contact information
Wenwen Chen: Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Wuhan 430074, China
Xiaoming Wang: Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Wuhan 430074, China
Mingkai Tu: Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Wuhan 430074, China
Fengjiao Qu: Engineering Technology Research Institute, PetroChina Huabei Oilfield Company, Renqiu 062550, China
Weiwei Chao: China United Coalbed Methane Company Limited, Taiyuan 030000, China
Wei Chen: CBM Exploration and Development Branch, PetroChina Huabei Oilfield Company, Jincheng 047000, China
Shihui Hou: Laboratory of Geotechnical Engineering, Jinggangshan University, Ji’an 343000, China

Energies, 2022, vol. 15, issue 20, 1-14

Abstract: Hydraulic fracturing is the main technical means for the reservoir stimulation of coalbed methane (CBM) vertical wells. The design of fracturing fluid volume (FFV) is mainly through numerical simulation, and the numerical simulation method does not fully consider the water block damage caused by the leakage of fracturing fluid into the reservoir. In this work, the variance analysis method was used to analyze the production data of 1238 CBM vertical wells in the Fanzhuang block and Zhengzhuang block of the Qinshui Basin, to clarify the relationship between the FFV and the peak gas production (PGP) under the different ratios of critical desorption pressure to reservoir pressure (R c/r ), and to reveal the controlling mechanism of fracturing fluid on CBM migration. The results show that both the FFV and R c/r have a significant impact on gas production. When R c/r < 0.5, the PGP decreases with the increase of the FFV, and the FFV that is beneficial to gas production is 200–500 m 3 . When R c/r > 0.5, the PGP increases first and then decreases with the increase of FFV. Specifically, the FFV that is favorable for gas production is 500–700 m 3 . Excessive FFV does not significantly increase the length of fractures due to leaks in the coal reservoir. Instead, it is more likely to invade and stay in smaller pores, causing water block damage and reducing gas production. Reservoirs with high R c/r have larger displacement pressure, which can effectively overcome the resistance of liquid migration in pores, thereby reducing the damage of the water block. Therefore, different reservoir conditions need to match the appropriate fracturing scale. This study can provide guidance for the optimal design of hydraulic fracturing parameters for CBM wells.

Keywords: coalbed methane; hydraulic fracturing; fracturing fluid volume; analysis of variance; water block (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
https://www.mdpi.com/1996-1073/15/20/7673/pdf (application/pdf)
https://www.mdpi.com/1996-1073/15/20/7673/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:15:y:2022:i:20:p:7673-:d:945444

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().